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首页> 外文期刊>Heat transfer >Modeling and CFD Simulation of a Mixed-Convection Flow of Regular Fluids and Nanofluids in Vertical Porous and Regular Channels
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Modeling and CFD Simulation of a Mixed-Convection Flow of Regular Fluids and Nanofluids in Vertical Porous and Regular Channels

机译：垂直多孔和规则通道中常规流体和纳米流体混合对流的建模和CFD模拟

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摘要

In this article, the problem of combined forced and free convection in vertical porous and regular channels for both regular fluids and nanofluids has been solved using the CFD technique in the entrance regions of momentum and heat transfer taking into account the influences of viscous heating and inertial force. In this regard, various types of viscous dissipation models reported in the literature such as the Darcy model, the power of the drag force model, and the clear fluid-compatible model were applied. In the case of nanofluid flow, both the Brownian and thermophoresis molecular transfer mechanisms were considered. The dimensionless distributions of velocity, temperature, and the volume fraction of nanoparticles were determined in terms of corresponding dimensionless numbers such as the Grashof, Reynolds, Forchheimer, Brinkman, and Darcy numbers. The predicted results were validated using fully-developed distributions of velocity and temperature. In addition, the influences of the Grashof number value on the temperature and velocity distributions in the entrance and fully-developed regions were examined carefully. In addition, temperature and velocity distributions of nanofluids and regular fluids in porous and regular channels were compared.
机译：在本文中，考虑到粘性加热和惯性的影响，使用CFD技术解决了动量和传热入口区域中垂直流体和纳米流体在垂直多孔和规则通道中的强制对流和自由对流相结合的问题。力。在这方面，文献中报道了各种类型的粘性耗散模型，例如达西模型，阻力模型的功率以及透明流体相容模型。在纳米流体流动的情况下，考虑了布朗和热泳分子转移机制。纳米粒子的速度，温度和体积分数的无量纲分布是根据相应的无量纲数确定的，例如Grashof，Reynolds，Forchheimer，Brinkman和Darcy数。预测的结果已通过充分开发的速度和温度分布进行了验证。另外，仔细检查了格拉斯霍夫数值对入口和发达区域温度和速度分布的影响。另外，比较了纳米流体和规则流体在多孔和规则通道中的温度和速度分布。

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